Automatically-adjustable mixer for gas-burner valves.



A. I. REEDY.

AUTOMATICALLY ADJUSTABLE MIXER FOR' GAS BURNER VALVES.

APPLICATION FILED MAR-4.19M-

Patented Sept. 14, 1915.

fry/11:

COLUMBIA FLANOGRAPH 00., WASHINGTON. n. c.

ALFREDJ. REEDY, OF BATTLE CREEK ens AIENT FlEEiQE MICHIGAN, ASSIGNOR TOA-B. STOVE COMPANY,

OFBAT'ILE CREEK, MICHIGAN, A CORPORATION OF MICHIGAN.

v AU'TOMATICALLY-ADJUSTAIBLE MIXER FOR GAS-BURNER VALVES.

Specification of Letters Patent.

Patented Sept. 14, 1915.

Application filed March 4, 1915. Serial No. 12,151.

To all whom it may concern:

Be it known that I, ALFRED J. REEDY, a

lowing is a specification, reference beinghad therein to theaccompanying drawings.

The invention relates to gas and air mixing devices for gas burners ofthe Bunsen burner type, the gas being delivered from a nozzle into amixing tube of larger diameter. It is usual to provide the mixing tubewith means for variably restricting the admission of air, so as toproduce the proper mixture when the gas valve is open. If, however, thequantity of gas delivered to the nozzle is varied the adjustment of theair valve which is proper for the full volume of gas will not be rightfor use with the more limited quantity.

It is the object of the present invention to overcome this objection byproviding means automatically operated by the gas valve for varying theair admission, so that in each position of adjustment there will be aproportionate volume of gas, and air.

It is a further object to combine this automatic adjusting means with ameans for automatically changing the gas nozzle so that with arestricted discharge of gas the velocity is maintained by acorresponding restriction of the nozzle and a corresponding adjustmentof the air admission.

In the drawings: Figure 1 is a longitudinal section through my improvedconstruction; Fig. 2 is an end elevation of the air mixing tube and itscontrolling valve; and Fig. 3 is a plan view showing the connectionbetween the gas and air valves. Fig. 4 is a section taken on line ww ofFig. 1.

A is the gas supply tube, B is the control valve preferably of the plugtype and C is a nozzle through which the gas from the valve isdischarged.

D is the mixing tube having the usual bell-shaped mount, and E is a capfor said tube having apertures F therein which may be variablyrestricted by a register slide G. This slide Gr is rotatively mountedupon a central pivot H, which is hollow for the insertion of the nozzle0 therethrough.

The nozzle 0 is preferably provided with automatic means for adjustingits size in different positions of adjustment of the control valve. Asshown, this is accomplished by forming a split inner nozzle I having atapering end engaging a correspondingly tapered portion of an outernozzle J, while the inner end of said inner nozzleis in operativerelation to a cammed portion K of the plug valve. Thus when the valve isturned to a position restricting the flow of gas the inner nozzle I isforced by the action of the cam into the tapering outer nozzle J whichwill contract the orifice in the nozzle. On the other hand when thevalve is wide open, the cam will relieve pressure on the inner nozzlepermitting it to expand and enlarge the gas orifice.

For automatically adjusting the air valve G correspondingly to theadjustment of the gas valve I have provided the following construction:L is a fulcrum or pivot secured to the cap E, and M is a lever pivotedon said fulcrum and connected at one end to a link N, which at itsopposite end is connected to a lug O on the stem of the valve B. Thelever M is provided with a slotted outer end P, which engages a pin Qupon the register slide G, and the arrangement is such that a rotationof the valve stem B will cause a corresponding rotation of the registerslide G, so that the quantity of air admitted is proportionate to thequantity of gas.

With the construction as described, when the valve is once properlyadjusted and set it is possible'to turn the gas down or up withoutaffecting the quality of the mixture. It is particularly desirable wherethe burner is to be used alternatively for low or high fire, and willavoid on the one the popping out due to an excess of air, or the smokyflame due to an excess of gas.

hat I claim as my invention is 1'. The combination with a gas cook, of agas discharge nozzle projecting therefrom having its free end split, andlongitudinally adjustable through rotative adjustment of the cock, and amember inclosing said nozzle having an outlet alined with that of thenozzle and having a portion of its interior surface tapered adjacentsaid outlet, longitudinal adjustment of the nozzle toward said outletserving to reduce the passage through the nozzle through contact of thenozzle extremity with said tapered surface.

'2; The combination With a gas cook, of a nozzle pro ecting therefromhaving its free end split, and means for exerting pressure transverselyupon the split end of the nozzle to reduce its discharge area when thecock is rotatively adjusted toward its closed position.

3. The combination witha gas cook, of a nozzle projecting therefromhaving its free end split, and a member having an outlet alined with thenozzle outlet and having a tapered surface adjacent said outlets, arelative longitudinal motion of said nozzle and said member beingactuated by the valve when the same is rotatively adjusted, where-Gopies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

through contact with said tapered surface.

4:. The combination with a gas cock, of a for increasing or decreasingthe contraction of the nozzle proportionately as the cock:

is beingclosed or opened, an air tube into which said nozzle extends,andmeans actuated by the cock for varying the supply of air to said tube. V1

In testimony whereof I affix-my signature in presence of-two witnesses.1 i r Y ALFRED J 'REEDY, Witnesses: 1 r V V V ,P.'C. DE VoL, A. B.PURDY.

Washington, D. G. V V

by the discharge area of the nozzle is reduced I nozzle projectingtherefrom havingvits free end split and normally contracted means

